scsi-disk: lazily allocate bounce buffer
It will not be needed for reads and writes if the HBA provides a sglist. In addition, this lets scsi-disk refuse commands with an excessive allocation length, as well as limit memory on usual well-behaved guests. Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com> Signed-off-by: NKevin Wolf <kwolf@redhat.com>
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